Contamination of Drinking Water by Coliform Bateria in Kassala City-Sudan
- Publication date
- 2009
- Publisher
- UOFK
Abstract
This study was conducted to investigate the coliform bacterial
contamination of drinking water of Kassala city during March to June
2008.
Seventy samples of water were taken from seven different areas
main station, El-shảbiya, El-halanga, El-ảmriya, El-gasor, El-kara, Elbrno (ten samples each), including chemically treated water from the
main station and untreated water from wells. Bacterial coliform
contamination was investigated by Multiple fermentation tube technique
to detect the existence of total and thermotolerant coliforms at 37◦C and
44◦C, respectively.
The total coliform bacteria were detected in 46 (65.7%) samples,
while thermotolerant coliform bacteria were detected in 31 (44.3%)
samples.
A total of 57 isolates were obtained from 46 samples,which were
identified according to their microscopic, cultural and biochemical
properties as: Escherichia coli(38.6%), Enterobacter aerogenes(17.5%),
Enterobacter cloacae(15.8%),Klebsiella pneumoniaesubspecies
aerogenes(12.3%), Klebsiella pneumoniaesubspeciesozaenae (8.8%)
and Citrobacter freundii(7%).
Citrobacter freundiiand Klebsiella pneumoniae ssp.ozaenaewere
found in untreated water only. While the other species were found in both
treated and untreated water with higher prevalence in untreated water.
The wells in the centeral city (El-halanga and El-ảmriya) contained more
coliform bacteria, especially Escherichia colithan wells which exist near
Gash river (El-gasor) in the side of the cit